I think there's a benefit for some people in letting go a bit. Even if you love your job, you need to understand that the system we work in is purpose-built to exploit workers. It's great to be focused on your work when you're working, but once you're done for the day you should unplug as much as you can. Taking PTO? Don't check slack or emails.

I love what I do, but I've found that even still if I let that fact convince me to work more than what is required of me I will eventually feel burnt out and eventually depressed. Maybe this isn't the case for everyone, but it's life outside of work that brings true meaning and purpose to my life. Time with friends and loved ones, going outside into nature and having new experiences, these are all things that make me actually happy. Loving my work just means I'm not sad when I'm at work.